Boost guage problems

[Lturbo6]

My autometer boost guage will not go past 15 pounds of boost. I got an autometer c2 guages. I recently switched from the phantom guages and they were doing the same thing. Car been tested at shop doing over 21 pounds of boost with an scanmaster. Its making way over 15 pounds, vacuum working fine, connected under the hood where it suppose to be. I need some help ladies and gentleman. Any suggestions. It's been rewired at the same spot nylon line replaced-- damn what gives?

 

[captflash]

Yeah, I'm having the same issues with my Autometer Phantom II boost gauge too. The FAST log reads several lbs lower than the gauge and which to trust, a $60+ gauge or the $2000 FAST system? The Stewart Warner gauge I took out and replaced with the Phantom II reads the same as the FAST. This is the second PhantomII gauge that has done this to me. I like having all the gauges match but I'm putting the SW gauge back in and letting things ride.

 

[TheGovernment]

I have an autometer cobalt gauge and it does the exact same thing. Goes to 15 lbs and stops there. I know i'm at over 20 with alky but theres no reason to have the problem, everything is hooked up right, can only be the gauge. This is my second one too.

 

[williamsGN]

I've used two different autometer gauges, not the cobalts, no problems. Just to be sure, tap the line that runs right next to the PCV line, that eliminates the chance of any leaks before your current tap point.

 

[Lturbo6]

I've used two different autometer gauges, not the cobalts, no problems. Just to be sure, tap the line that runs right next to the PCV line, that eliminates the chance of any leaks before your current tap point.

I'll try that. Thing driving me up a wall.